Altec Lansing Interchangeable Silicone Jacket Bluetooth Speaker (iMW645-BLK XL) Rugged interchangeable rubberized jackets in black and red included Built-in rechargeable Li-ion battery with up to 10 hours of playback time On board microphone for hands-free communications 3.5mm Aux connector for added device compatibility Rugged interchangeable rubberized jackets in black and red included Built-in rechargeable Li-ion battery with up to 10 hours of playback time On board microphone for hands-free communications Altec DSP Audio Enhancement technology for optimum music playback 3.5mm Aux connector for added device compatibility